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热爱学习 发表于 2015-8-13 17:07 # q/ a& d, c: f% ~# K
固体绝缘29.3的三条是选择性的,只要满足其中一条即可,厚度仅仅是其中一条,并非必须满足
7 b% X1 j5 S+ e6 m$ J: A而且第三条就 ...
5 N* x& c# Z0 g9 P# W# w$ @22.33 条款2的问题可以归结于对于可接触的导电液体单层绝缘是否可靠的问题,很明显,标准是认为不可靠的,水和金属应该考虑为一体,因为金属是导电没有绝缘的,做绝缘的只是单层的陶瓷体,就算陶瓷体可以做为加强绝缘,也是单层的,也就是说这种结构是绝对不允许的,考虑陶瓷体开裂的问题,还是直接包三层绝缘胶带比较靠谱
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s& G& ]+ x2 D6 _For class II construction, conductive liquids that are or may become accessible in normal( M2 t9 N0 M& Z# ^, c& }
use and conductive liquids that are in contact with unearthed accessible metal parts shall7 |5 A! `% Q5 m- {8 Q, Y( c, X
not be in direct contact with basic insulation or reinforced insulation unless the reinforced! ~1 @2 H5 Y5 I' t" k, W
insulation consists of at least 3 layers. |
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